// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import "internal/platform/implementation/apple/GNCUtils.h"

#import <CommonCrypto/CommonDigest.h>

NS_ASSUME_NONNULL_BEGIN

const int GNCSocketVersion = 2;

NSData *GNCSha256Data(NSData *data) {
  unsigned char output[CC_SHA256_DIGEST_LENGTH];
  CC_LONG length = (CC_LONG)data.length;
  if (!CC_SHA256(data.bytes, length, output)) return nil;
  return [NSData dataWithBytes:output length:CC_SHA256_DIGEST_LENGTH];
}

NSData *GNCSha256String(NSString *string) {
  return GNCSha256Data([string dataUsingEncoding:NSUTF8StringEncoding]);
}

NSData *GNCMd5Data(NSData *data) {
  unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];
  CC_MD5(data.bytes, (CC_LONG)data.length, md5Buffer);
  return [NSData dataWithBytes:md5Buffer length:CC_MD5_DIGEST_LENGTH];
}

NSData *GNCMd5String(NSString *string) {
  return GNCMd5Data([string dataUsingEncoding:NSUTF8StringEncoding]);
}

NSString *GNCConvertDataToHexString(NSData *_Nullable data) {
  NSUInteger dataLength = data.length;
  if (dataLength == 0) {
    return @"0x";
  }

  const unsigned char *dataBuffer = (const unsigned char *)data.bytes;
  NSMutableString *hexString = [NSMutableString stringWithCapacity:dataLength * 2];

  for (NSUInteger i = 0; i < dataLength; ++i) {
    [hexString appendFormat:@"%02lx", (unsigned long)dataBuffer[i]];
  }

  return [NSString stringWithFormat:@"0x%@", hexString];
}

NS_ASSUME_NONNULL_END
